Drawing sheet glass



March 2 1926.

T. c. M KINLEY DRAWING SHEET GLASS Filed Nov. 5, 192:5

ATTUZFNE Y rapid rate of drawing of the sheet, a pa .r of water coolers is mounted parallel to, and one 7 tical sides of these-coolers.

specification.

littented Mar. 2, 1 926.

UNITED STATES PATENT oFFice.

THOMAS C. MCKINLEY, O1? CHARLESTON, WEST VIRGIN IA, ASSIGNOR TO THE LIIBBEY- OWENS SHEET-GLASS COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO.

DRAWING SHEET GLASS.

Application filed November To all whomitmay concern:

Be it known that I, THOMAS C. MCKIN- LEY, a citizen of the United States, residing at Charleston. in the county of Kanawha and State of West Virginia, have invented new and useful Improvements in Drawing Sheet Glass, of which the following is a This invention relates to nnprovements in the art of drawing sheet glass, and more particularly to an improved form of cooler or internally cooledslueld for. use in con trolling the temperature of the glass at the sheet source.

In the Colburn process of drawing sheet glass, as set forth more particularly in the )atent granted to 1. iv. Colburn, 1,248,809,

ecember l, 1917, a sheet of glass is drawn upwardly from a shallow pool of molten glass, and in order to control the temperature of the molten glass at the sheet source and quickly chill the same to permit a more at each side of the sheet and closely adjacent to the molten glass from which the sheet is drawn. These coolers are of a rectangular cross-section with their narrow lower faces positioned as closely as possibleto the upper surface of the pool of molten glass and their inner vertical faces arranged parallel to the sides of thesheet and spaced a few inches therefrom. These coolers functionto cool the surface-glass just prior to its heing drawn upwardly into the surfaces of the sheet, and also function to cool the surfaces of the drawn sheet and to shield the same trom the hot air currents which might otherwise come into contact with the forming sheet. x

The cooler now in use is formed of a thin metallic casing, and a constant stream of cold water is passed thcrethrough. A great deal of trouble has been caused at times by the condensation of water on the outer ,The object of the present invention is to so modify the cooler body that this .conden sation trouble will be avoided. In the improved form of cooler hereinafter described,-.

this is accomplished by providing hollow compartments or air-jackets along the two vertical. sides of the water compartments so that the cooling eilect of these portions of the apparatus will be tempered to such an verliquid is passed. A pipe 10 passes through 5, 1923. Serial No. 672,801.

extent that the condensation on the exterior walls will not .take place.

The objects and advantages of this invention will be better understood from the following detailed description of one approved form of the apparatus.

. In the accompanying drawings:

Fig. 1 is a vertical longitudinal section through a portionof the sheet drawing apparatus, showing the improved coolers in transverse vertical section.

Fig. 2 is a transverse vertical section, taken substantially on the line 22 of F 1, through the sheet drawing apparatus shop ing one of the coolers in side elevation, portions of the cooler being broken away to disclose its interior construction.

Fig. 3 is an end elevation, on an enlarged scale, of one of the coolers, the feed pipes being shown in section, taken substantially on the line 33 of Fig. 2.

The glass sheet 1 is drawn upwardly from thepool of molten glass 2 in receptacle 3, and is then deflected about bending-roller 4 into the "horizontal plane, where it is car ried off through suitable flattening and an nealing apparatus. All this is substantially as disclosed in the Colhurn patent referred to above. Thetwo' coolers 5 are arranged parallel to the sheet adjacent its source with their bottom edges 6 closely adjacent to the upper surface of the pool'ofmolten glass 2. It is to be understood that these improved coolers, as hereinafter described, might be used equally well in other forms of glass working apparatus than that above de" scribed. I

Each cooler body is divided by a pair of parallel vertical interior partitions 7 into a series of three narrow compartments entirely separated from one another. Preferably, the central compartment 8 is of greater capacity than the two side compartments 9;

Itis through the central compartment 8 that the current of cooling water or other one end wall of the casing and extends substantially throughout the length of the upper portion of chamber 8. The cold Water passes in through this pipe 10 and'emerges into the compartment 8 through a plurality of openings 11. A second pipe 12 connects through the upper wall of chamber 8 adjacent one end thereof, and it is through this pipe that the water passes out. It will be forced in,"communicates through a manifold ll with one end of each of the side compart- .1 ments 9. This air is allowed to escape from;

noted that this water-cooled chamber 8 is indirect contact with the bottom wall 6 of the cooler so thatthe' maximum chillingv effect may be exerted along this wall of the cooler upon the molten glass therebeneath.

A third pipe 13, through which air 1sthe other endof these co artments through the outlet manifold 15 a acent the opposite end thereof. These blankets of air in the two side compartments 9 act as a tem ering mediumbetween the cold water in t "interior chamber 8 and the heated atmosphere outside of thecooler, so that onlya modified chilling eifect; is exerted along the vertical side walls of the cooler andth e condensation of water on these surfaces will be largely avoided. At'the same timethe maximum chilling effect oft the cooler along its,bot-

' tom surface, where most es'ired, is not interfered with. The cooleralso." functions as an effective. shieldagainst the hot 'air currents tending to flow against; the sheet source, from within't-he furnace. Claims: 1. A cooler for use in sl eetglass drawing apparatus comprising ahollow casing having a plurality of compartments, means for passing air through the compartment closest -to, the "sheetbeing drawn, and means for passing acooling fluid through the remaining compartments.

, 2. A cooler for use-in a sheetglass drawing apparatus, comprising a hollow metallic casing, having a plurality of longitudinally extending interiorv chambers, and means for maintaining a flow of cooling fluid through vt-ions into t ree longitudinally extending compartments, means for maintaining a flow of cooling fluid through the interior compartment, and means for maintaining a flow of air through the two side compartments.

- 5. A cooler for use. in a sheet-glass'drawing apparatus, comprising a substantially rectangularly hollow metallic casing,'means within the casing for water cooling the bottom thereof, and air-jackets between the water-cooling means walls of the casing.

. 62 A cooler for use in a sheet-glass draw fling apparatus, comprising a substantially 'rectangularly hollow metallic casing, means within the casing for v water-cooling the bottom thereof, hollow-compartments between the water-coohngmeans and the vertical side walls of the casing, and means for maintaining a'flo'w of air throughthese compartments.

and the vertical side- Signed at- Charleston, in the county of Kanawha, and State of West'Virginia, this 2 9th day ofoctober, 1923,

THOMAS; C. McKINLEY. 

